Não informado. (1951). Increasing understanding of public problems and policies. Farm Foundation.
Style de citation Chicago (17e éd.)Não informado. Increasing Understanding of Public Problems and Policies. Chicago, Ill: Farm Foundation, 1951.
Style de citation MLA (8e éd.)Não informado. Increasing Understanding of Public Problems and Policies. Farm Foundation, 1951.
Attention : ces citations peuvent ne pas être correctes à 100%.